Electrical

Question 1

Q1: How many Amps are each TRU rated at?

Answer 1

A. TRU1: 350 Amps
TRU2: 350 Amps
TRU3: 225 Amps (additional 125 Amps dedicated to FBWPC)

Question 2

Q2: Up to what altitude can the APU generator be used?

Answer 2

A. 41,000’

Question 3

Q3: What is the maximum load on the AC generators?

Answer 3

A. 75 kVA continuous

Question 4

Q4: What is used on the A220 to provide emergency AC power?

Answer 4

A. RAT (Ram Air Turbine)

Question 5

QS: How many TRUs do we have on the A220?

Answer 5

A. 3

Question 6

Q6. What are the two primary sources of AC power?

Answer 6

A. The 2 VFGs (variable frequency generator)

Question 7

Q7. How many batteries do we have on the aircraft?

Answer 7

A.2

Question 8

Q8. What types of batteries do we have on the aircraft?

Answer 8

A. NiCad batteries (Nickel Cadmium)

Question 9

Q9. What are the 4 possible sources of AC power for the aircraft (ground and flight)?

Answer 9

A. 1. VFG’s 2.APU
3. EXT AC 4.RAT

Question 10

Q1O. What does PMAG stand for? What is it used for?

Answer 10

A. Permanent Magnet Alternator/Generator
B. FBWPC’s (Alternate Source) and EEC of each FADEC

Question 11

Q11. What are the 3 parameters checked when EXT AC power is connected to the aircraft?

Answer 11

A. Frequency, voltage and phase

Question 12

Q12. When connected, if external AC power is suitable, what indication do you have on the overhead panel?

Answer 12

A. Green AVAIL light on the external power switch

Question 13

Q13. In which condition does the RAT provides emergency AC power?

Answer 13

A. Complete loss of AC power

Question 14

Q14. Where is the RAT stored?

Answer 14

A. Right side of the wing-to-belly fairing, near the right main landing gear

Question 15

Q15. How many kVA is the RAT rated for?

Answer 15

A. 10 kVA

Question 16

Q16. Other that supplying electrical power, the RAT also powers another component, what is it?

Answer 16

A. The RAT hydraulic pump

Question 17

Q17. When does the RAT automatically deploy? What switch can manually deploy?

Answer 17

A. Full loss of AC power in-flight
B. RAT GEN switch

Question 18

Q18. Which buses are powered by the RAT?

Answer 18

A. AC ESS Bus and DC ESS bus (through TRU3)

Question 19

Q19. Which message comes on EICAS, when the batteries have been supplying
power for more than 5 minutes?

Answer 19

A. BATT DISCHARGING (caution msg) & horn alert outside

Question 20

Q20. Which buses are powered when the EXT PWR switch is used on theoverhead
panel?

Answer 20

A. The entire electrical system

Question 21

Q21. What is the purpose of the CABIN PWR switch? What does it isolate?

Answer 21

A. It is used to isolate cabin smoke sources by deactivating electrical loads. B. Galley(s)andin-flightentertainmentsystemsetc.

Question 22

Q22. What is the purpose of the RAT GEN guarded switch?

Answer 22

A. Allows the flight crews to manually deploy the RAT

Question 23

Q23. What is the purpose of the L DISC and R DISC guarded switches?

Answer 23

A. Allowsthecrewtodisconnecttherespectivegeneratorshaftfrom the accessory gearbox

Question 24

Q24. Which message displays on EICAS in case of low oil pressure or high oil temperature?

Answer 24

A. L GEN OIL or R GEN OIL

Question 25

Q25. Which DC bus is not normally displayed on the electrical page?

Answer 25

A. DC EMER Bus

Question 26

Q26. What is the purpose of the BATT 1 & BATT 2 switches?

Answer 26

A. It allows the respective BATT DIR bus to be connected to its corresponding DC ESS bus

Question 27

Q27. What is the purpose of the BUS ISOL switch in either MAIN or ESS?

Answer 27

A. It isolates the selected EPCs preventing automatic reconfiguring of the electrical load distribution.

Question 28

Q28: What buses are Identified as the hot buses of the aircraft?

Answer 28

A. 1. DC EMER bus 2. BATT DIR BUS1 3. BATT DIR BUS2

Question 29

Q29: What are the conditions in which the battery chargers will activate?

Answer 29

A. 1. Battery switch is in AUTO; and corresponding AC Bus is powered 2. If in Ground Service Mode Operation (regardless of Batt switch position)

Question 30

Q30; Which buses are powered when the aircraft is in ground service mode (not including the hot buses)?

Answer 30

A. ACBUS1,ACBUS2& DCBUS1(FCOM17-2-5)